An accurate assessment of bleeding patterns after IUD insertion rests on the quality of data gathered. In 2005, Mishell issued guidelines for standardization of data collection and analysis of bleeding patterns for combined hormone contraceptive trials, and noted the need for prospective comparative studies of the accuracy of electronic data collection versus paper diaries (Mishell, 2005). There are no published data comparing the quality and quantity of information obtained using these two methods, but text messages are increasingly used to collect data in clinical trials. This study affords us the opportunity to compare this new modality with existing methods.